Thermostatic circuit-controller.



W. L. JAUOBY. THERMOSTTIG CIRCUIT CONTROLLER.' APPLICATION FILED FBB. 12,1913.

LOQTCLO..

llatented May 26, 19142.

movement of 'the elenient l?) is, thcre'if'ore,

the element 1;' n'hich would l'oree the ends44 olthe element l?) apart, therehy preventing the elena-nt l?) troni any lauhstantial move nient ii'ivfard and i'roin in'nLn'n-ting such an inward inorenient to the sind S. Thue, the thermal nieinher capable oit bringing the sind S and poet i'- into 'contact and thereby closing the alarln circuitJ whenvt'ht surrounding air l a sudden rise in temperature, such as that produced lijf a 'lire near the therinal inenilrer, hut does not close the alarm circuit when the riae in temperature is slow, auch as reanlts 'troni norinal conditions. lt frequently desired, however, that the alarm circuit yhoulfl he closed when the temperature ot the `aiwounding, air, by a slow rise, han` reached a predeternlined'niaxinuun. in order that this may he accomplished 1without complicating the structure, the elements lf2 and` 'l' are preferably made of ditl'erent materials, the 'tornier having a lower coeliicient oi expansion than the lab.

ier, and the elements l2 and 13 boing` so proportioned a5 to their ina` and superficial area that the expaneinn of element 18 is Very Slightly in exerfla ot' that which can be neutralized by the expaneion of the. element 40 AS thus arranged, when.. the temperature rieee there i continually aslight inward movement ol' the ,alud S, ao that, at the predeterniimzd niaxiiniun temperature, the circuit iS closed even though the element l2,

as well as the element 13, has reached this temperature and the Arise in temperature has been slow. Thus, the alarm closes when the temperature hm4 reached the dang-el` pointl whether the rise has been Slow or fast.

5@ ln order that the Screw post i' may he se curely locked in any position to which it may he adjuetcd, the plate 3 is provided with a portion 15 which is separated from the ad- *joining portionsof the plate hy the Slots 1G and i7 and is liue inade nu 'able the threaded hole through which the post 7 passes ie Mbrlned in` one-'edge of this portion l5.

18 is a Set Screw which Werke in the plate 3 against one edge of the movable portion l5 and operates to clamp it againstthe post 7 and therehy'loek the poeti securely in place. i9 S20 are binding posts fixed to and lin electrical connection with the plate 3 and 55 projecting oiitaide of ease on opposite the device is connected in circuit, t is 'through the plate 3, entering at one einem y between the positive and negative W 1 M) when installed` this open side 1S closed, *om iight fitting block-oi insulation secured.

e neazgelic sides and insulated from the case., Q2 arefbinding posts which are se c the out/side of the case on opposti These :tour posts are pref n look alike, as Shown in the drawinga ofi/one polarity are connected to me j l) and 2O andthe Wires of the epnoeit larity are connected to po "te Thus, the current of one pola ,y ,com if@ the case and emerging at the oppositie si thereof, and the current of 'the cpp@ i. polarity passes through the case its/ef4 entering at one Side of the case and ems-ir;d at the opposite side thereof. The alarm e cuit is closed when the contacte teach and thereby ferr-a a crees con any unauthorized person attempts to oise nectthe device from its circuit, le he most likely to connect, aethe )firsthiS operation, two ot' the posts or W the Same side of the case, euch ae 19 and 2l or their connected c This would produce a cross between tf tive and negative Wires and ciose the circuit and lead te detection ci? nach. pering.

The case is cast open on ite inner si to the case by-eolts 2e which p5 s three lugs Q5 on the case The nuts. which. he these bolts rest in holes conntereunlz the outer side of the block 23, the holes lsv ing'illed above the nuts with an inseln @errent 26, The entire device is secured 'to Wall ceiling by screws 2'?. which pees ih o'f holes in the block i 28 is perforated guard. plate te the 'thermal member. lt i dende "ici/ose the case-outside of the thermal nienh lt will he seen that the case ie sche t-,ially 'clust and moisture prooi, that the vice is Simple, compact and durable in strnctnre, is protected from unauthorized inter ference and may be readily installed in po- Sit'ion, onwall or ceiling, as a, unitary etrncji; ture. lt will also loe Seen that-its Contact:J may be adjusted, 'with great convenience,\{o open and close the alarm circuit at; the l aired temperature simply by turning',` one clement, namely, the post i?.

ln lfig'e. al and 5, 29 is a nietal yoke ad ed to he secured to a Wall or ceiling by incr of Screws 30 and provided Willi hindii poste 3l. for the eireiiit Wires of po larity. a bracket c-itending' Shown in Figc. l, Q and EL in electrical connection with the thermal member. and,

n.. 'JU

tications, it will be understoo ing` blocks screws 36.

plate Sby screws 43 and surrounding the' inner end ot' the post 39.' 44: are the binding posts 'for the negative circuit wires and se- Vcured to the plate 37.

In Fig. l the thermal member 33 `carries a xed contact stud 45 which performs the olice of a cont-act in association with the contact post 39. It enters within the tubular member l2 tronraiholein the yoke. The tubular member ll2'is closed at one end by the plate 37 and at the other end by the yolre Thus, the yolte, tl1e tubular member and the plate provide an inclosing case for the contacts to protect the contacts from dust and moisture. When these contacts touch7 they establish a cross between the positive and negative sides of the circuit in the same way as is done inthe structure shown in Figs. l, 2 and 3.

F ig. 5 differs from Fig. t in that the contact which cooperates with 'the post 39 is carried by the yoke within the tubular member [2 and the stud carried by the thermal member is not itselr" an electrical contact, although it is a contact maker', as is the stud in the other igures of the drawings. ln Fig., 5 the thermal member 83 carries a stud the upper end of which' is made of insulation and bears against a spring con tact Ll-T mechanically and electrically secured to the yoke 29. lNhen the stud 4:6 moves inward, it pushes contact i7 against contact post thereby establishing a cross between the positive and negative wires.

.While the invention is herein shown in its preferred form and two of its ossible modi;- that various other changes may be made without departing from the scope of the invention.

l. The cmnbination with a contact device,

of a thermostat for operatingsaid device and comprising a plurality' of elements having different physical characteristics whereby the contact operating movement of the thermostat under the influence of relatively slow elevations of temperature below a definite degree is prevented, and having other dilierent characteristics whereby the operation of the contact device is ei'ected for elevations in temperature above said definite degree irrespective of the rate of change.

Q. A thermos-tatie couple consisting of elements of diderent material and having different mass, and aiconnection between said elements whereby the variation in expansion due to differences in mass neutralizes the effect of expansion result-nig from relatively slow elevations of temperature below a critical point7 while permit-ting the variation in expansion due to dillerences in material to be edective 'for all elevations ot temperature above the critical point.

3'. A thermostat consisting of abar of material of considerable mass, and a relatively thin strip of material secured at its ends to the bar and being bowed with respect thereto7 the material composing' the bar and strip having different coeilicients of eXpansion, the bar and strip being so proportioned as to their mass and Superlicial area that the expansion of one is slightly in excess of that which can be neutralized by the v l expansion of the other.

4. In .a thermostatic circuit controller, the combination of a case, a stationary contact within the case, a thermal memberhaving a diderential movement, said thermal sie member comprising two strips rigidly 'connected at their ends, said strips being so proportioned as to their mass and superficial area that the expansion of one is slight-ly in excess of that which can be neutralized by the expansion of the other, a bracket fixed exteriorly to' the case to which the thermal member is secured at its middle portion, and a contact stud secured to said thermal member and passing through a wall of the case into coacting relation with said stationary Contact, said contact stud having a movement resulting from the differential movement of said thermal membern 5. The combination with a case having twopairs of terminals, each pair being situated at opposite sides and near one extremity ofsaid case, the diagonally opposite terminals of the two pairs being conductively connected, and a thermostatic controller within the case adapted to short circuit the pairs of terminals.

6. In a thermostatic circuit controller, the combination-of a metal case; a conducting plate lined within the case and insulated thereof; andvbinding post-s connecting with said conducting plate and projecting outside of the case on opposite sides and .insulated therefrom.

7. In a thermostatic circuit controller, the combination of a metal case; a conducting plate xed within the vcase; and insulated therefrom, said 'plate being provided with a threaded hole' and having a movablel por- A 4130 tion containing part of said hole; a set screw llo' 

